MPL 20x3x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020130
GTIN/EAN: 5906301811367
length
20 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.9 g
Magnetization Direction
↑ axial
Load capacity
2.33 kg / 22.90 N
Magnetic Induction
370.68 mT / 3707 Gs
Coating
[NiCuNi] Nickel
0.394 ZŁ with VAT / pcs + price for transport
0.320 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical details - MPL 20x3x2 / N38 - lamellar magnet
Specification / characteristics - MPL 20x3x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020130 |
| GTIN/EAN | 5906301811367 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 0.9 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.33 kg / 22.90 N |
| Magnetic Induction ~ ? | 370.68 mT / 3707 Gs |
| Coating | [NiCuNi] Nickel |
| Manufacturing Tolerance | ±0.1 mm |
Magnetic properties of material N38
| properties | values | units |
|---|---|---|
| remenance Br [min. - max.] ? | 12.2-12.6 | kGs |
| remenance Br [min. - max.] ? | 1220-1260 | mT |
| coercivity bHc ? | 10.8-11.5 | kOe |
| coercivity bHc ? | 860-915 | kA/m |
| actual internal force iHc | ≥ 12 | kOe |
| actual internal force iHc | ≥ 955 | kA/m |
| energy density [min. - max.] ? | 36-38 | BH max MGOe |
| energy density [min. - max.] ? | 287-303 | BH max KJ/m |
| max. temperature ? | ≤ 80 | °C |
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
| properties | values | units |
|---|---|---|
| Vickers hardness | ≥550 | Hv |
| Density | ≥7.4 | g/cm3 |
| Curie Temperature TC | 312 - 380 | °C |
| Curie Temperature TF | 593 - 716 | °F |
| Specific resistance | 150 | μΩ⋅cm |
| Bending strength | 250 | MPa |
| Compressive strength | 1000~1100 | MPa |
| Thermal expansion parallel (∥) to orientation (M) | (3-4) x 10-6 | °C-1 |
| Thermal expansion perpendicular (⊥) to orientation (M) | -(1-3) x 10-6 | °C-1 |
| Young's modulus | 1.7 x 104 | kg/mm² |
Engineering modeling of the magnet - report
The following data are the outcome of a engineering simulation. Results were calculated on models for the class Nd2Fe14B. Real-world conditions may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
MPL 20x3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3700 Gs
370.0 mT
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
medium risk |
| 1 mm |
2103 Gs
210.3 mT
|
0.75 kg / 1.66 lbs
752.3 g / 7.4 N
|
safe |
| 2 mm |
1172 Gs
117.2 mT
|
0.23 kg / 0.52 lbs
233.7 g / 2.3 N
|
safe |
| 3 mm |
721 Gs
72.1 mT
|
0.09 kg / 0.20 lbs
88.5 g / 0.9 N
|
safe |
| 5 mm |
345 Gs
34.5 mT
|
0.02 kg / 0.04 lbs
20.3 g / 0.2 N
|
safe |
| 10 mm |
101 Gs
10.1 mT
|
0.00 kg / 0.00 lbs
1.7 g / 0.0 N
|
safe |
| 15 mm |
42 Gs
4.2 mT
|
0.00 kg / 0.00 lbs
0.3 g / 0.0 N
|
safe |
| 20 mm |
21 Gs
2.1 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
| 30 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Sliding load (wall)
MPL 20x3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.15 kg / 0.33 lbs
150.0 g / 1.5 N
|
| 2 mm | Stal (~0.2) |
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
|
| 3 mm | Stal (~0.2) |
0.02 kg / 0.04 lbs
18.0 g / 0.2 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 20x3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 20x3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 lbs
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
Table 5: Working in heat (material behavior) - thermal limit
MPL 20x3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
|
|
| 80 °C | -6.6% |
2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 lbs
1659.0 g / 16.3 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 20x3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
5.06 kg / 11.17 lbs
4 866 Gs
|
0.76 kg / 1.67 lbs
760 g / 7.5 N
|
N/A |
| 1 mm |
3.01 kg / 6.64 lbs
5 705 Gs
|
0.45 kg / 1.00 lbs
452 g / 4.4 N
|
2.71 kg / 5.97 lbs
~0 Gs
|
| 2 mm |
1.64 kg / 3.61 lbs
4 205 Gs
|
0.25 kg / 0.54 lbs
245 g / 2.4 N
|
1.47 kg / 3.24 lbs
~0 Gs
|
| 3 mm |
0.89 kg / 1.97 lbs
3 106 Gs
|
0.13 kg / 0.29 lbs
134 g / 1.3 N
|
0.80 kg / 1.77 lbs
~0 Gs
|
| 5 mm |
0.31 kg / 0.67 lbs
1 816 Gs
|
0.05 kg / 0.10 lbs
46 g / 0.4 N
|
0.27 kg / 0.61 lbs
~0 Gs
|
| 10 mm |
0.04 kg / 0.10 lbs
690 Gs
|
0.01 kg / 0.01 lbs
7 g / 0.1 N
|
0.04 kg / 0.09 lbs
~0 Gs
|
| 20 mm |
0.00 kg / 0.01 lbs
202 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
24 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
14 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
9 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
6 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
5 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
3 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 20x3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 3.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 2.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.5 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (cracking risk) - collision effects
MPL 20x3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
51.34 km/h
(14.26 m/s)
|
0.09 J | |
| 30 mm |
88.88 km/h
(24.69 m/s)
|
0.27 J | |
| 50 mm |
114.74 km/h
(31.87 m/s)
|
0.46 J | |
| 100 mm |
162.27 km/h
(45.08 m/s)
|
0.91 J |
Table 9: Anti-corrosion coating durability
MPL 20x3x2 / N38
| Technical parameter | Value / Description |
|---|---|
| Coating type | [NiCuNi] Nickel |
| Layer structure | Nickel - Copper - Nickel |
| Layer thickness | 10-20 µm |
| Salt spray test (SST) ? | 24 h |
| Recommended environment | Indoors only (dry) |
Table 10: Construction data (Flux)
MPL 20x3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 1 748 Mx | 17.5 µWb |
| Pc Coefficient | 0.32 | Low (Flat) |
Table 11: Submerged application
MPL 20x3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.33 kg | Standard |
| Water (riverbed) |
2.67 kg
(+0.34 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet retains just approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces the holding force.
3. Power loss vs temp
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.32
This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.
Material specification
| iron (Fe) | 64% – 68% |
| neodymium (Nd) | 29% – 32% |
| boron (B) | 1.1% – 1.2% |
| dysprosium (Dy) | 0.5% – 2.0% |
| coating (Ni-Cu-Ni) | < 0.05% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Check out also offers
Advantages and disadvantages of neodymium magnets.
Pros
- They do not lose magnetism, even during nearly ten years – the drop in power is only ~1% (according to tests),
- They show high resistance to demagnetization induced by external field influence,
- By applying a decorative layer of nickel, the element has an professional look,
- Magnets are distinguished by very high magnetic induction on the working surface,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
- Thanks to modularity in forming and the ability to adapt to unusual requirements,
- Huge importance in modern industrial fields – they serve a role in magnetic memories, motor assemblies, medical devices, as well as technologically advanced constructions.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in realizing threads and complex shapes in magnets, we propose using casing - magnetic mount.
- Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child safety. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
- whose thickness reaches at least 10 mm
- with an ground touching surface
- under conditions of gap-free contact (metal-to-metal)
- during detachment in a direction vertical to the plane
- in temp. approx. 20°C
Lifting capacity in practice – influencing factors
- Distance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the power to be escaped to the other side.
- Material type – the best choice is pure iron steel. Stainless steels may attract less.
- Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate lowers the holding force.
Warnings
Do not overheat magnets
Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and pulling force.
Pinching danger
Risk of injury: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
GPS and phone interference
A powerful magnetic field disrupts the operation of magnetometers in smartphones and navigation systems. Do not bring magnets near a smartphone to avoid breaking the sensors.
Magnets are brittle
Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
No play value
Adult use only. Small elements pose a choking risk, causing severe trauma. Keep away from children and animals.
Respect the power
Before use, read the rules. Uncontrolled attraction can break the magnet or injure your hand. Think ahead.
Sensitization to coating
Studies show that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, avoid touching magnets with bare hands or select coated magnets.
Pacemakers
For implant holders: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Combustion hazard
Powder produced during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Cards and drives
Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can permanently damage these devices and erase data from cards.
